Eliminate old style import from language tests

tests/language/default_factory_library_test.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Dart test program for testing default factories defined across libraries
 
-#library("test");
-#import("default_factory_library.dart", prefix:"lib");
+library test;
+import "default_factory_library.dart" as lib;
 
 class B implements lib.A {
   int methodA() { return 1; }
   int methodB() { return 2; }
 }
 
 class C {
   // References an interface in another library
   factory lib.A () { return new B(); }
 }
 
 main() {
   var val = new lib.A();
   Expect.equals(true, (val is B));
   Expect.equals(1, val.methodA());
   Expect.equals(2, val.methodB());
 }